/*
 * Copyright (c) 2007-2012, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
package com.sun.org.apache.bcel.internal.generic;

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache BCEL" must not be used to endorse or promote products
 *    derived from this software without prior written permission. For
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 *
 * 5. Products derived from this software may not be called "Apache",
 *    "Apache BCEL", nor may "Apache" appear in their name, without
 *    prior written permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
import java.io.*;
import com.sun.org.apache.bcel.internal.util.ByteSequence;
import com.sun.org.apache.bcel.internal.classfile.ConstantPool;
import com.sun.org.apache.bcel.internal.ExceptionConstants;

/**
 * MULTIANEWARRAY - Create new mutidimensional array of references
 * <PRE>Stack: ..., count1, [count2, ...] -&gt; ..., arrayref</PRE>
 *
 * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
 */
public class MULTIANEWARRAY extends CPInstruction implements LoadClass, AllocationInstruction, ExceptionThrower {
    private short dimensions;

    /**
     * Empty constructor needed for the Class.newInstance() statement in
     * Instruction.readInstruction(). Not to be used otherwise.
     */
    MULTIANEWARRAY() {
    }

    public MULTIANEWARRAY(int index, short dimensions) {
        super(com.sun.org.apache.bcel.internal.Constants.MULTIANEWARRAY, index);

        if (dimensions < 1)
            throw new ClassGenException("Invalid dimensions value: " + dimensions);

        this.dimensions = dimensions;
        length = 4;
    }

    /**
     * Dump instruction as byte code to stream out.
     * @param out Output stream
     */
    public void dump(DataOutputStream out) throws IOException {
        out.writeByte(opcode);
        out.writeShort(index);
        out.writeByte(dimensions);
    }

    /**
     * Read needed data (i.e., no. dimension) from file.
     */
    protected void initFromFile(ByteSequence bytes, boolean wide) throws IOException {
        super.initFromFile(bytes, wide);
        dimensions = bytes.readByte();
        length = 4;
    }

    /**
     * @return number of dimensions to be created
     */
    public final short getDimensions() {
        return dimensions;
    }

    /**
     * @return mnemonic for instruction
     */
    public String toString(boolean verbose) {
        return super.toString(verbose) + " " + index + " " + dimensions;
    }

    /**
     * @return mnemonic for instruction with symbolic references resolved
     */
    public String toString(ConstantPool cp) {
        return super.toString(cp) + " " + dimensions;
    }

    /**
     * Also works for instructions whose stack effect depends on the
     * constant pool entry they reference.
     * @return Number of words consumed from stack by this instruction
     */
    public int consumeStack(ConstantPoolGen cpg) {
        return dimensions;
    }

    public Class[] getExceptions() {
        Class[] cs = new Class[2 + ExceptionConstants.EXCS_CLASS_AND_INTERFACE_RESOLUTION.length];

        System.arraycopy(ExceptionConstants.EXCS_CLASS_AND_INTERFACE_RESOLUTION, 0, cs, 0, ExceptionConstants.EXCS_CLASS_AND_INTERFACE_RESOLUTION.length);

        cs[ExceptionConstants.EXCS_CLASS_AND_INTERFACE_RESOLUTION.length + 1] = ExceptionConstants.NEGATIVE_ARRAY_SIZE_EXCEPTION;
        cs[ExceptionConstants.EXCS_CLASS_AND_INTERFACE_RESOLUTION.length] = ExceptionConstants.ILLEGAL_ACCESS_ERROR;

        return cs;
    }

    public ObjectType getLoadClassType(ConstantPoolGen cpg) {
        Type t = getType(cpg);

        if (t instanceof ArrayType) {
            t = ((ArrayType) t).getBasicType();
        }

        return (t instanceof ObjectType) ? (ObjectType) t : null;
    }

    /**
     * Call corresponding visitor method(s). The order is:
     * Call visitor methods of implemented interfaces first, then
     * call methods according to the class hierarchy in descending order,
     * i.e., the most specific visitXXX() call comes last.
     *
     * @param v Visitor object
     */
    public void accept(Visitor v) {
        v.visitLoadClass(this);
        v.visitAllocationInstruction(this);
        v.visitExceptionThrower(this);
        v.visitTypedInstruction(this);
        v.visitCPInstruction(this);
        v.visitMULTIANEWARRAY(this);
    }
}
